TPMS batteries going low. 10yrs is about max life for them.
10 years if you're lucky - I have had them not last 5 years. It's actually a good idea to have them replaced when you get new tires, since they have to break down the tires to replace them when they go bad anyway.
HOWEVER, I would try rotating and re-learning the tires first, just to make sure the system itself isn't having a fault, since he says BOTH front tires are saying they're low. I don't recall if his has just one receiver in the center of the truck or if there's one for the fronts and one for the rears, I have heard it could be either, but if the receiver itself is having issues this will tell you: if the low tire warning follows the tires then it's the sensors in the tires, if it stays put it's the receiver.
I'm not saying it IS the receiver but it's a good idea to check it before spending any real money, and tire rotations are dirt cheap (free if you can do them yourself).
